AromaTherapy Ultrasonic Oil Essential Diffuser & Humidifer Quiet Wood Grain 130ML W/ 6 Color LED Night Light This is the New Wood Grain Ultrasonic Diffuser Ultrasonic Humidifier Air Purifier. With the compact portable USB design, it holds 130ml of fluid. Especially design for the high-grade people who love life. Fashion design, mini portable diffuser, you can use it anywhere you want. Powered by USB cord. 130ml capacity, can continuous work up to four hours. Applying to small area about 5-10 square meters. It will improve humidity, moisturizes and refreshes the quality of air we breathe. The mini ultrasonic air purifier can improve air quality regulate air humidity, remove all kinds of odors, improve human immunity. With ultra-silent design, you can work and sleep, it can offer you a simple, healthy and enjoyable way of skin care, let you keep in good health.